Westerbeke 20.0 BEDA - Fuel Injector Testing and Pattern

ENGINE ADJUSTMENTS
If the pressure is different from the standard value, adjust to
the specified pressure by increasing or decreasing the thick-
ness of the adjusting shim.
The shim
has 10 different thicknesses for every 0.05 mm
(0.0020 in) from 1.0 mm (0.0393 in) to 1.95 mm (0.0768 in).
As 0.05 mm (0.0020 in) is increased, approx. 5.0 kg/cm
2
(71.1lb/in
2
)
of injection pressure increases.
When replacing
the shim, grip the retaining nut in a vise and
remove the body with a wrench. Tighten the retaining nut to
the specified torque.
INSPECTING THE SPRAY PAnERN
1. Operate the hand lever of the nozzle tester at intervals of
one stroke per second to check if the fuel is injected cor-
rectly
in its axial direction. A nozzle is defective if it
injects fuel in an oblique direction or in several separate
strips.
Also, a spmy in the form of particles indicates a
defect. These defects
may sometimes be caused by clog-
ging with dust and, therefore, all parts should be carefully
cleaned
before reassembly. (Care should be taken not to
expose one's skin to this spray as it may penetrate the
skin and cause infection.)
NORMAL FAULTY ANGLE
FAULTY DIRECTION
CHATTERING TEST
2. Apply the pressure of 115 kglcm
2
(1635lb/in
2
)
to nozzle
by operating the hand lever, and check the drips from the
nozzle tip. If it drips or has a large accumulation of fuel
on the bottom, it is considered defective and should. be
replaced. A very small amount of fuel may sometimes
remain
on the tip of the nozzle; however, this. does not
indicate a defect.
CORRECT WRONG
AFTER DRIP TEST
Engines & Generators
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